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Related Experiment Video

Updated: Feb 19, 2026

Reconfigurable Microfluidic Channel with Pin-discretized Sidewalls

Reconfigurable Microfluidic Channel with Pin-discretized Sidewalls

Published on: April 12, 2018

Millimeter-Sized Hole Damming.

So Hung Huynh¹, Dwayne Chung Kim Chung¹, Murat Muradoglu¹

¹Laboratory for Optics and Applied Mechanics, Department of Mechanical & Aerospace Engineering, Monash University , Clayton, Victoria 3800, Australia.

Langmuir : the ACS Journal of Surfaces and Colloids

|November 9, 2017

Summary

This summary is machine-generated.

This study demonstrates passive liquid control using millimeter-scale holes in hydrophilic and superhydrophobic substrates. These passive valves enable flow based on hydrostatic pressure, offering simple and robust alternatives to actuated valves.

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Area of Science:

Fluid Dynamics
Materials Science
Surface Science

Background:

Traditional liquid control systems rely on actuated valves, which can be complex and prone to failure.
Developing passive methods for liquid flow control is crucial for simplifying processes and enhancing robustness.

Purpose of the Study:

To investigate the potential of passive, hydrostatic pressure-actuated liquid flow control using millimeter-scale holes.
To compare the flow resistance mechanisms on hydrophilic and superhydrophobic surfaces.

Main Methods:

Fabrication of receptacles with millimeter-scale holes (1.0-2.0 mm) at the base, using hydrophilic and superhydrophobic substrates.
Analysis of liquid drainage velocities and comparison with Torricelli's law.
Experimental demonstration using an upward water jet to probe flow onset and resistance thresholds.

Main Results:

Both hydrophilic and superhydrophobic substrates exhibited drainage flow velocities consistent with Torricelli's law.
Hydrophilic surfaces resisted flow onset via contact angle threshold non-breaching.
Superhydrophobic surfaces maintained stable liquid-gas interface deformation, preventing leakage under jet pressure.

Conclusions:

Passive liquid control is achievable using engineered surfaces and millimeter-scale orifices.
Distinct surface properties dictate different mechanisms for flow resistance.
These findings suggest simpler, more robust liquid handling solutions for various applications.